12117856 has 12 divisors (see below), whose sum is σ = 23857092. Its totient is φ = 6058912.

The previous prime is 12117851. The next prime is 12117863. The reversal of 12117856 is 65871121.

12117856 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (12117851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 189310 + ... + 189373.

It is an arithmetic number, because the mean of its divisors is an integer number (1988091).

Almost surely, 2^12117856 is an apocalyptic number.

12117856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

12117856 is a deficient number, since it is larger than the sum of its proper divisors (11739236).

12117856 is an equidigital number, since it uses as much as digits as its factorization.

12117856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 378693 (or 378685 counting only the distinct ones).

The product of its digits is 3360, while the sum is 31.

The square root of 12117856 is about 3481.0710995324. The cubic root of 12117856 is about 229.6899160990.

Adding to 12117856 its reverse (65871121), we get a palindrome (77988977).

The spelling of 12117856 in words is "twelve million, one hundred seventeen thousand, eight hundred fifty-six".